Incandescent electric lamp.



CLARENCE A. VET'IER, OF PITTSBURGH, PENNSYLVANIA INCANDESGENT ELECTRIC LAMP.

Patented Oct. 19, 1915.

Application filed .l'uly 31, 1913, Serial No. 782,374. Renewed January 7, 1915. Serial No, 1,047.

To all whom it may concern:

Be it known that I, CLARENCE A. Vn'rTnn, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Incandescent Electric Lamps, of which the following is a specification.

This invention relates to that class of sockets or holders for incandescent electric lamps which are provided withlocking means to prevent the unauthorized removal sis The invention comprises the construction and arrangement of parts hereinafter described and claimed.

In the accompanying drawing, Figure 1 is an elevation of a portion of an incandescent lamp socket, partly broken away to show the improvements; Fig. 2 is an elevation of .the same taken at right angles to the view shown in Fig. 1; and Figs. 3 and 4 are respectively plan and edge views of the key.

In the drawing, the numeral 1 indicates the shell of an incandescent lamp socket, which may be of'the usual or any desired form, and is shown as enlarged at its upper portion where the usual insulating body 2 is located, and is contracted at its lower portion wherein is contained the usual threaded sleeve for receiving the shank of the lamp or bulb. The body 2 will preferably be formed of porcelain. as is the usual practice. Located immediately adjacent and below the insulating b0dy2 is a disk 3, also of insulating material, such as porcelain, and to which will be attached the threaded sleeve for receiving the lamp socket, said disk 3 being rotatably connected to the body 2, as is usual in this type, of lock socket.

The disk 3 is formed on its periphery with a key engagingpart which is shown as an abutment or shoulder formed by a wall 4 socket.

of a recess in the periphery of the disk, and the shell has an opening 5 in the same general plane as the disk 3, and on its outside there is attached, as by rivets 7 a fitting 6 which is provided with a key way 8 extending therethrough and registering with the opening 5. The key way admits of the insertion of a suitable 'key'or locking member 9 (Figs. 3 and 4) which when inserted engages the key engaging part 4: in the disk 3 and holds the latter-from turning with the lamp. To prevent tampering with the lamp a threaded bore or passage '10 is formed in the fitting 6 and cr vsses the key way at a right angle thereto. In this threaded bore is a set screw 11 which, when screwed inwardlyeloses the key way and prevents the insertion of the key. This set screw is pro.- vided with a special head, preferably triangular, as shown at 12, and the key 9 is provided with a correspondingly shaped socket 13, by means of which the screw 11 can be rotated-to clear the key way. The key is provided with wings 14; for its easy manipulation.

In the use of the invention the screw 11 is backed out to clear the key Way, after which the shank of the key isinserted through the key way and into contact with the key engaging part 4, thus holding against rotation the disk 3 and the lamp receiving sleeve connected therewith. This enables the lamp to be either screwed in or screwed out of the The key -is then removed and the screw 11 screwed inwardly to close the key way. An unauthorized person is unable to then remove the lamp because the lamp receiving sleeve and the disk 3 will rotate freely and prevent disengagement of the lamp from the sleeve.

The disk 3 of insulating material is located immediately adiacent and below the insulating body 2 and is of very nearly the same diameter as the latter. and of greater diameter than the contracted lower portion ofthe shell and, therefore, of greater diameter than the lamp receiving threaded sleeve, so that said disk 3 projects peripherally beyond the metal portion containing the lamp. Consequently, it is impossible for the key when inserted to come in contact with any live metal portion, whereby injury or danger to the operator is avoided.

'VVhat I claim .is:

1. In an incandescent lamp socket, the combination of a shell, a member rotatable therein, a fitting secured to said shell and 2. In an incandescent lamp socket, the

combination of a shell, a member rotatable therein, a fitting secured to said shell and provided with a key way-and with a passage'crossing said key way, a key adapted to enter said key way and hold said rotatable member against rotation, and a barrier adapted to said crossing passage and having an'operating portion adapted to be engaged by the key.

3, In an incandescent lamp socket, the combination-of a shell, an insulating body whereof a pa rtis stationary in the shell and a part rotatable with the lamp, means'for holding said latter partagainst rotation, and a barrier arranged to prevent said holding means from engaging said rotatable part.

Copies of thispatent may be obtained for five cents each, by addressing the Commissioner of Patents.

4. In anvincandescent lamp socket, the

combination'of shell provided with a key a way, of a body of insulating material in said .way, of an insulating body stationary in said shell, an insulating disk located directly adjacent said insulating body and rotatable thereon and With thelampand projecting peripherally beyond the lamp receiving threaded metal sleeve and provided with a key engaging part, and a key adapted to be inserted through the key way in the shell and engage only said insulating disk.

In testimony whereof I aflix my signature in presence of two Witnesses.

CLARENCE A. VETTER. \Vitnesses:

MATILDA DORNBURG,

B. S. HARE.

Washington, D. 0.

through said key Way 

